Erik Erikson's theory of psychosocial development identifies eight stages through which people progress from infancy to late adulthood. During adolescence (ages 13-18), the central concern is identity development as teens search for who they are and their place in the world. Key tasks include distinguishing themselves from childhood, gaining peer acceptance, developing competence, and making commitments to beliefs and activities. Psychosocial development continues into young adulthood as people choose careers, pursue independence, form intimate relationships, and establish personal values and philosophies.